Malicious PDF — malware analysis report

Static analysis result for SHA-256 58650bba55f623bb…

MALICIOUS

PDF

106.6 KB Created: 2021-06-28 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0a3f851606d487c7994e99ee9fbb2fe SHA-1: 2f0964924239ece08211869ab9bfc330021cfb32 SHA-256: 58650bba55f623bbeccf4a55f7532ef34fd5d56bd4aabac19ecc293204cf582f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=willem+dafoe+the+lighthouse+monologue PDF link annotation
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a8e57f644b081fefa339d5d76e56b4a2/52711405380.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/12345686384.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/defedanepeva.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/42088733961.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/93848522684.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a6051cf9d6380eaeb18e02e06b682fbc/99039537018.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jg2a7o25bto9atg3p0lcbm8765/26644811768.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1ca801d8d158f2454b98a9afa3623a12/gububuripatedederili.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/bukukoxakuvajabojewisa.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9562d1d45e---kuxijekexulotasajas.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/76088617c81fa2d7628507342b2408dd/40235201557.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608841cc17716---vomejusilimuxusul.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1a5e6ff6e---27946186939.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/65829948538.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894664b06e6---92982608321.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f07b40d7---24167639939.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/25900605956.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2c8d41c2d5d6c0888e679e977825c387/61795715831.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/09dd91a395dda18a97129c4b7a7c9ac4/17456879790.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qbd5595ajc1bo0brme7ohsoemu/23213892667.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/newunak.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2e4d9b3f52da42504a98e2b054ae861e/luladedisejejatag.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3affb8d17dec20119bc2134003eba58e/badefezodanemoles.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f1d3d868602e5fb2230dfa8b5fc93743/94908354088.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/152js93v33pkglpicmb0n2njh3/88805131738.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdd7b5772---tiluwesij.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/73892636430.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FC 17948 bytes
SHA-256: 2b44d8b83f64bf9dc14fffad8788502342bce73ea7433850568d04975315ccac
font_02_sfnt_off00018452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18452 10792 bytes
SHA-256: 91fcccafa99c50344d279dd041277a2c0d5b90a1e0116b00b98a156a5d797fc8

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